Is there any easy way to simply transfer the settings, mailboxes, filters, etc., from Poco Mail 3 to Barca? I have been using Poco for a long time and while I would love to switch to Barca, I don't want to have to start from scratch and have to use two programs for an indefinite time.

What you have to do is use the restore function in Barca. What you have to point to is the PM ini file and then all will be imported....well, sort of.

After you do a restore to Barca, you will have to go through all your settings because some of them will not be transferrred and you will have to do them manually over again. The good thing though is that most of the things are transferred successfully.